(19)
(11) EP 1 367 344 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.01.2004 Bulletin 2004/01

(43) Date of publication A2:
03.12.2003 Bulletin 2003/49

(21) Application number: 03012317.8

(22) Date of filing: 29.05.2003
(51) International Patent Classification (IPC)7: F25B 49/02, F25B 41/04, F25B 9/00
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 30.05.2002 US 156804

(71) Applicant: PRAXAIR TECHNOLOGY, INC.
Danbury, CT 06810-5113 (US)

(72) Inventor:
  • Howard, Henry Edward
    Grand Island, New York 14072 (US)

(74) Representative: Schwan - Schwan - Schorer 
Patentanwälte Bauerstrasse 22
80796 München
80796 München (DE)

   


(54) Method for operating a transcritical refrigeration system


(57) A method for operating a transcritical refrigeration system wherein a compressor parameter such as output pressure (210), pressure ratio or power consumption is monitored using heat exchanger refrigerant inflow temperatures (201) and/or outflow temperatures and also the enthalpy change across the evaporator (7) and adjusting the compressor operation or refrigerant fluid working mass accordingly.






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